some sample with gstreamer

2017-07-21 19:06:00 +08:00
commit 49c51cce5d
38 changed files with 2514 additions and 0 deletions
@@ -0,0 +1,100 @@
+#include <gst/gst.h>
+#include <string.h>
+
+typedef struct _CustomData {
+  gboolean is_live;
+  GstElement *pipeline;
+  GMainLoop *loop;
+} CustomData;
+
+static void cb_message (GstBus *bus, GstMessage *msg, CustomData *data) {
+
+  switch (GST_MESSAGE_TYPE (msg)) {
+    case GST_MESSAGE_ERROR: {
+      GError *err;
+      gchar *debug;
+
+      gst_message_parse_error (msg, &err, &debug);
+      g_print ("Error: %s\n", err->message);
+      g_error_free (err);
+      g_free (debug);
+
+      gst_element_set_state (data->pipeline, GST_STATE_READY);
+      g_main_loop_quit (data->loop);
+      break;
+    }
+    case GST_MESSAGE_EOS:
+      /* end-of-stream */
+      gst_element_set_state (data->pipeline, GST_STATE_READY);
+      g_main_loop_quit (data->loop);
+      break;
+    case GST_MESSAGE_BUFFERING: {
+      gint percent = 0;
+
+      /* If the stream is live, we do not care about buffering. */
+      if (data->is_live) break;
+
+      gst_message_parse_buffering (msg, &percent);
+      g_print ("Buffering (%3d%%)\r", percent);
+      /* Wait until buffering is complete before start/resume playing */
+      if (percent < 100)
+        gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+      else
+        gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+      break;
+    }
+    case GST_MESSAGE_CLOCK_LOST:
+      /* Get a new clock */
+      gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
+      gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
+      break;
+    default:
+      /* Unhandled message */
+      break;
+    }
+}
+
+int main(int argc, char *argv[]) {
+  GstElement *pipeline;
+  GstBus *bus;
+  GstStateChangeReturn ret;
+  GMainLoop *main_loop;
+  CustomData data;
+
+  /* Initialize GStreamer */
+  gst_init (&argc, &argv);
+
+  /* Initialize our data structure */
+  memset (&data, 0, sizeof (data));
+
+  /* Build the pipeline */
+  pipeline = gst_parse_launch ("playbin uri=file:///home/charley/Music/7.wav", NULL);
+  bus = gst_element_get_bus (pipeline);
+
+  /* Start playing */
+  ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
+  if (ret == GST_STATE_CHANGE_FAILURE) {
+    g_printerr ("Unable to set the pipeline to the playing state.\n");
+    gst_object_unref (pipeline);
+    return -1;
+  } else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
+    data.is_live = TRUE;
+  }
+
+  main_loop = g_main_loop_new (NULL, FALSE);
+  data.loop = main_loop;
+  data.pipeline = pipeline;
+
+  gst_bus_add_signal_watch (bus);
+  g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);
+
+  g_main_loop_run (main_loop);
+
+  /* Free resources */
+  g_main_loop_unref (main_loop);
+  gst_object_unref (bus);
+  gst_element_set_state (pipeline, GST_STATE_NULL);
+  gst_object_unref (pipeline);
+  return 0;
+}
+